Hi,

 We are using Symantec LiveUpdate Administrator version 2.3.5.99 . Since a few days ago we have problems with downloading new definitions on the server.

 Server is connected to "liveupdate.symantecliveupdate.com" through proxy server. When we manually start download, we can see that there is a traffic through the proxy and some files are downloaded in the "temporary directory". But after few seconds transfer stops and we are getting "Download request XXXX started by USER has failed". 

 We've tried many times to delete the content of the "Temporary" and "Download" directories, tried to change some server connection settings recommended here (https://www.symantec.com/connect/articles/liveupdate-administrator-2x-server-connection-recommendations), but without success. There is enough space on the HDD where the new definitions are stored.

 Please help us to resolve this issue.

 Thank in advance!

check if you are able to download all three, the problem should be with proxy/firewall

How to determine whether your firewall is blocking LiveUpdate

https://support.symantec.com/en_US/article.TECH139451.html

This KB article was just released:

http://www.symantec.com/docs/TECH247845

Looks to be a known issue, but, a workaround is posted in it so you may want to try it out.

 We've made a recommended changes in lua_static.properties file and splitted in 2 separete schedules (as it was proposed)  "Content Updates" and "Client Updates", but again without success.

According to this comment:

https://www.symantec.com/connect/forums/symantec-live-update-administrator-download-failed#comment-11921141

...a hotfix is available, but, you need to open a support ticket to get it.